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Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study
Du JP; Wang YJ(王云江); Lo YC; Wan L; Ogata S; Wang, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Source PublicationPHYSICAL REVIEW B
2016
Volume94Issue:10Pages:104110
ISSN2469-9950
AbstractAccelerated molecular dynamics reveals a mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries (GBs) in Cu. At stress levels up to similar to 90% of the ideal dislocationnucleation stress, atomic shuffling at the E structural unit in a GB acts as a precursor to dislocation nucleation, and eventually a single dislocation is nucleated. At very high stress levels near the ideal dislocation-nucleation stress, a multiple dislocation is collectively nucleated. In these processes, the activation free energy and activation volume depend strongly on temperature. The strain-rate dependence of the critical nucleation stress is studied and the result shows that the mechanism transition from the shuffling-assisted dislocation-nucleation mechanism to the collective dislocation-nucleationmechanism occurs during the strain rate increasing from 10(-4) s(-1) to 10(10) s(-1).
DOI10.1103/PhysRevB.94.104110
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000383141100001
WOS Research AreaPhysics
WOS SubjectPhysics, Condensed Matter
Funding OrganizationThis work was supported by Grants-in-Aid for Scientific Research in Innovative Area (Grant No. 22102003), Scientific Research (A) (Grant No. 23246025), Challenging Exploratory Research (Grant No. 25630013), and the Elements Strategy Initiative for Structural Materials (ESISM). Y.W. acknowledges financial support from the NSFC (Grants No. 11402269 and No. 11672299).
DepartmentLNM冲击动力学与新型材料力学性能
Classification一类
RankingFalse
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59733
Collection非线性力学国家重点实验室
Corresponding AuthorWang, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Du JP,Wang YJ,Lo YC,et al. Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study[J]. PHYSICAL REVIEW B,2016,94(10):104110.
APA Du JP,王云江,Lo YC,Wan L,Ogata S,&Wang, YJ .(2016).Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study.PHYSICAL REVIEW B,94(10),104110.
MLA Du JP,et al."Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study".PHYSICAL REVIEW B 94.10(2016):104110.
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